Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2007-02-27
2007-02-27
Ip, Paul (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C318S805000, C318S812000
Reexamination Certificate
active
11081394
ABSTRACT:
A pump assembly for pumping a liquid and a method of controlling the pump assembly. The pump assembly includes a motor coupled to a pump, and an electronic switch assembly electrically connected to the motor to control the current through the motor. The electronic switch assembly includes an electronic switch, a generator that provides a substantially periodic pulsing signal, a circuit control configured to provide a second signal, and decision logic connected to the generator, the circuit control, and the electronic switch. The decision logic receives the periodic pulsing and second signals and generates a control signal that selectively controls the electronic switch based on the periodic pulsing and second signals.
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A. O. Smith Corporation
Ip Paul
Michael & Best & Friedrich LLP
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